Chip package

ABSTRACT

A chip package includes a first substrate, a second substrate, a first conductive layer, and a metal layer. The first substrate has a bottom surface and an inclined sidewall adjoining the bottom surface, and an obtuse angle is between the bottom surface and the inclined sidewall. The second substrate is over the first substrate and has a portion that laterally extends beyond the inclined sidewall of the first substrate. The first conductive layer is between the first substrate and the second substrate. The metal layer is on said portion of the second substrate, on the bottom surface and the inclined sidewall of the first substrate, and electrically connected to an end of the first conductive layer.

RELATED APPLICATION

This application is a divisional application of U.S. Pat. Application Serial Number 17/140,964, filed on Jan. 4, 2021, which claims priority to U.S. Provisional Application Serial Number 62/957,600, filed Jan. 6, 2020, which are herein incorporated by reference in their entirety.

BACKGROUND Field of Invention

The present invention relates to a chip package.

Description of Related Art

In some kinds of chip packages, preventing electromagnetic interference (EMI) is very important. For example, chip packages including microelectromechanical systems (MEMS), CMOS Image sensors (CIS), and antennas would be affected by electromagnetic interference during operation. In a typical chip package, a metal can structure may be additionally disposed on the substrate of the chip package. The metal can structure protects the sensing structure of the chip package below the metal can structure from electromagnetic interference.

However, the metal can structure has footprints on the substrate of the chip package, and a gap is formed between the metal can structure and the top of the chip package. As a result, chip miniaturization is difficult to be achieved.

SUMMARY

An aspect of the present disclosure is to provide a chip package.

According to some embodiments of the present disclosure, a chip package includes a first substrate, a second substrate, a first conductive layer, and a metal layer. The first substrate has a bottom surface and an inclined sidewall adjoining the bottom surface, and an obtuse angle is between the bottom surface and the inclined sidewall. The second substrate is over the first substrate and has a portion that laterally extends beyond the inclined sidewall of the first substrate. The first conductive layer is between the first substrate and the second substrate. The metal layer is on said portion of the second substrate, on the bottom surface and the inclined sidewall of the first substrate, and electrically connected to an end of the first conductive layer.

In some embodiments of the present disclosure, the metal layer includes a ground region and a redistribution line electrically isolated from the ground region.

In some embodiments of the present disclosure, said end of the first conductive layer is in contact with the ground region of the metal layer, and the first conductive layer is spaced apart from the redistribution line of the metal layer.

In some embodiments of the present disclosure, a top surface of the first substrate has a functional layer and a conductive pad in the functional layer, and the conductive pad has a sidewall in contact with the redistribution line of the metal layer.

In some embodiments of the present disclosure, the conductive pad is spaced apart from the ground region of the metal layer.

In some embodiments of the present disclosure, the functional layer laterally extends beyond the inclined sidewall of the first substrate, and the second substrate laterally extends beyond a sidewall of the functional layer.

In some embodiments of the present disclosure, the chip package further includes a first conductive structure and a second conductive structure. The first conductive structure is on a bottom surface of the ground region of the metal layer. The second conductive structure is on a bottom surface of the redistribution line of the metal layer.

In some embodiments of the present disclosure, the chip package further includes a bonding layer between the first substrate and second substrate.

In some embodiments of the present disclosure, the first substrate has a concave portion below the first conductive layer.

In some embodiments of the present disclosure, the chip package further includes a planarization layer and a passivation layer. The planarization layer is between the bottom surface of the first substrate and the metal layer, and is between the inclined sidewall of the first substrate and the metal layer. The passivation layer is below the metal layer and the planarization layer.

In some embodiments of the present disclosure, the chip package further includes a third substrate below the passivation layer and electrically connected to the metal layer.

In some embodiments of the present disclosure, the chip package further includes a second conductive layer between the bottom surface of the first substrate and the metal layer.

In some embodiments of the present disclosure, the first conductive layer is an antenna layer having a patch portion and a connection portion that is between the patch portion and the metal layer.

In some embodiments of the present disclosure, the patch portion has a greater width than the connection portion.

In the aforementioned embodiments of the present disclosure, since the metal layer is on the inclined sidewall of the first substrate, a portion of the metal layer can be electrically connected to an end of the first conductive layer. In one embodiment, said portion of the metal layer may be grounded, and thus the first conductive layer may serve as a shielding layer for electromagnetic interference (EMI). In another embodiment, the metal layer may be a redistribution line, and the first conductive layer may act as an antenna. As a result, the chip package does not need an additional metal can structure to prevent EMI, and does not need to connect an additional antenna outside the chip package. In other words, the miniaturization of the chip package containing a shielding layer or an antenna can be achieved.

An aspect of the present disclosure is to provide a chip package.

According to some embodiments of the present disclosure, a chip package includes a first substrate, a second substrate, a conductive layer, a bonding layer, and a metal layer. The first substrate has a first through hole and a first conductive pad in the first through hole. The second substrate is over the first substrate. The conductive layer is between the first substrate and the second substrate. The bonding layer is between the conductive layer and the first substrate, and the bonding layer includes conductive particles. The metal layer is in the first through hole, and is on a bottom surface of the first substrate and a sidewall of the first substrate, and is electrically connected to the conductive layer through the first conductive pad and the bonding layer.

In some embodiments of the present disclosure, the metal layer includes a ground region and a redistribution line, the ground region is electrically connected to the conductive layer, and the redistribution line is electrically isolated from the ground region.

In some embodiments of the present disclosure, the first substrate has a second through hole and a second conductive pad in the second through hole, and the redistribution line of the metal layer is electrically connected to the second conductive pad.

In some embodiments of the present disclosure, the chip package further includes a first conductive structure and a second conductive structure. The first conductive structure is on a bottom surface of the ground region of the metal layer. The second conductive structure is on a bottom surface of the redistribution line of the metal layer.

In some embodiments of the present disclosure, the first substrate has a concave portion below the conductive layer.

In some embodiments of the present disclosure, the chip package further includes a passivation layer below the metal layer.

In the aforementioned embodiments of the present disclosure, since the bonding layer including the conductive particles is between the conductive layer and the first substrate, a portion of the metal layer can be electrically connected to the conductive layer through the first conductive pad and the bonding layer. Said portion of the metal layer may be grounded, and thus the conductive layer may serve as a shielding layer for electromagnetic interference (EMI). As a result, the chip package does not need an additional metal can structure to prevent EMI. In other words, the miniaturization of the chip package containing a shielding layer can be achieved.

It is to be understood that both the foregoing general description and the following detailed description are by examples, and are intended to provide further explanation of the invention as claimed.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention can be more fully understood by reading the following detailed description of the embodiments, with reference made to the accompanying drawings as follows:

FIG. 1 is a top view of a chip package according to one embodiment of the present disclosure;

FIG. 2 is a cross-sectional view of the chip package taken along line 2-2 shown in FIG. 1 ;

FIG. 3 is a cross-sectional view of the chip package taken along line 3-3 shown in FIG. 1 ;

FIGS. 4 and 5 are two cross-sectional views of a chip package according to one embodiment of the present disclosure;

FIG. 6 is a top view of a chip package according to one embodiment of the present disclosure;

FIG. 7 is a top view of a chip package according to one embodiment of the present disclosure;

FIG. 8 is a cross-sectional view of the chip package taken along line 8-8 shown in FIG. 7 ;

FIG. 9 is a cross-sectional view of the chip package taken along line 9-9 shown in FIG. 7 ;

FIGS. 10 and 11 are two cross-sectional views of a chip package according to one embodiment of the present disclosure;

FIG. 12 is a top view of a chip package according to one embodiment of the present disclosure; and

FIG. 13 is a cross-sectional view of the chip package taken along line 13-13 shown in FIG. 12 .

DETAILED DESCRIPTION

Reference will now be made in detail to the present embodiments of the invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers are used in the drawings and the description to refer to the same or like parts.

FIG. 1 is a top view of a chip package 100 according to one embodiment of the present disclosure. FIG. 2 is a cross-sectional view of the chip package 100 taken along line 2-2 shown in FIG. 1 . As shown in FIG. 1 and FIG. 2 , the chip package 100 includes a first substrate 110, a second substrate 130, a first conductive layer 160, and a metal layer 150. The first substrate 110 has a bottom surface 113 and an inclined sidewall 111 adjoining the bottom surface 113, and an obtuse angle θ is between the bottom surface 113 and the inclined sidewall 111 of the first substrate 110. The second substrate 130 is over the first substrate 110 and has a portion that laterally extends beyond the inclined sidewall 111 of the first substrate 110. The first conductive layer 160 is between the first substrate 110 and the second substrate 130. The metal layer 150 is on said portion of the second substrate 130, on the bottom surface 113 and the inclined sidewall 111 of the first substrate 110, and electrically connected to an end of the first conductive layer 160. In some embodiments, the metal layer 150 and the first conductive layer 160 may be formed by performing physical vapor deposition (e.g., sputtering).

FIG. 3 is a cross-sectional view of the chip package 100 taken along line 3-3 shown in FIG. 1 . As shown in FIG. 1 to FIG. 3 , the metal layer 150 includes a ground region 152 a and a redistribution line 152 b (RDL) electrically isolated from the ground region 152 a. The ground region 152 a may be a rectangular conductive pattern, but the present disclosure is not limited in this regard. Moreover, an end of the first conductive layer 160 is in contact with the ground region 152 a of the metal layer 150 for electrical connection, while the first conductive layer 160 is spaced apart from the redistribution line 152 b of the metal layer 150 for electrical isolation.

Since the metal layer 150 is on the inclined sidewall 111 of the first substrate 110, a portion of the metal layer 150 (i.e., the ground region 152 a) can be electrically connected to an end of the first conductive layer 160. In some embodiments, the ground region 152 a of the metal layer 150 can be grounded, and thus the first conductive layer 160 may serve as a shielding layer for electromagnetic interference (EMI). As a result, the chip package 100 does not need an additional metal can structure to prevent EMI. In other words, the miniaturization of the chip package 100 containing a shielding layer can be achieved.

In some embodiments, the top surface 112 of the first substrate 110 has a functional layer 116 and a conductive pad 114 that is in the functional layer 116. The conductive pad 114 has a sidewall in contact with the redistribution line 152 b of the metal layer 150 for signal transmission. In contrast, the conductive pad 114 is spaced apart from the ground region 152 a of the metal layer 150 for electrical isolation.

In addition, the first substrate 110 may be a semiconductor substrate made of silicon. The second substrate 130 may be a light-transmissive sheet made of glass. If the chip package 100 is used for microelectromechanical systems (MEMS), the first conductive layer 160 may be a shielding layer made of copper, and the functional layer 116 of the first substrate 110 may include a MEMS structure. The first conductive layer 160 (i.e., the shielding layer) can prevents the chip package 100 from electromagnetic interference (EMI). If the chip package 100 is used for CMOS image sensor (CIS), the first conductive layer 160 may be a shielding layer made of indium tin oxide (ITO) to let light pass through, and the functional layer 116 of the first substrate 110 may include an image sensor. Moreover, the functional layer 116 may serve as a passivation layer made of dielectric material.

Furthermore, the chip package 100 further includes a bonding layer 104 between the first substrate 110 and second substrate 130. The bonding layer 104 and the functional layer 116 laterally extend beyond the inclined sidewall 111 of the first substrate 110, and the second substrate 130 laterally extends beyond a sidewall of the bonding layer 104 and a sidewall of the functional layer 116. The sidewall of the bonding layer 104 and the sidewall of the functional layer 116 are in contact with the metal layer 150.

Moreover, the chip package further includes a first conductive structure 200, a second conductive structure 200 a, a planarization layer 180, and a passivation layer 190. The first conductive structure 200 is on a bottom surface of the ground region 152 a of the metal layer 150. The second conductive structure 200 a is on a bottom surface of the redistribution line 152 b of the metal layer 150. The first and second conductive structures 200 and 200 a may be solder balls, and the present disclosure is not limited in this regard. The first and second conductive structures 200 and 200 a may be electrically connected to a printed circuit board. Moreover, the planarization layer 180 is between the bottom surface 113 of the first substrate 110 and the metal layer 150, and is between the inclined sidewall 111 of the first substrate 110 and the metal layer 150. The passivation layer 190 is below the metal layer 150 and the planarization layer 180, and surrounds the first and second conductive structures 200 and 200 a.

It is to be noted that the connection relationships and materials of the aforementioned elements will not be described again in the following description.

FIGS. 4 and 5 are two cross-sectional views of a chip package 100 a according to one embodiment of the present disclosure. The cross-sectional position of FIG. 4 is the same as that of FIG. 2 , and the cross-sectional position of FIG. 5 is the same as that of FIG. 3 . As shown in FIG. 4 and FIG. 5 , the chip package 100 a includes a first substrate 110 a, a second substrate 130, a first conductive layer 160, a metal layer 150, and a bonding layer 104 a. The difference between this embodiment and the embodiment shown in FIGS. 2 and 3 is that the first substrate 110 a has a concave portion 115 below the first conductive layer 160. Moreover, the first substrate 110 a has a functional layer 116 a thereon. The functional layer 116 a and the bonding layer 104 a surround the concave portion 115, such that the concave portion 115 of the first substrate 110 a directly face the first conductive layer 160.

FIG. 6 is a top view of a chip package 100 b according to one embodiment of the present disclosure. The chip package 100 b incudes a metal layer 150 a. The difference between this embodiment and the embodiment shown in FIG. 1 is that the ground region 152 a of the metal layer 150 a surrounds an area. The ground region 152 a of the metal layer 150 a may include a U-shaped conductive pattern.

FIG. 7 is a top view of a chip package 100 c according to one embodiment of the present disclosure. FIG. 8 is a cross-sectional view of the chip package 100 c taken along line 8-8 shown in FIG. 7 . As shown in FIG. 7 and FIG. 8 , the chip package 100 c includes a first substrate 110 b, a second substrate 130 a, a conductive layer 160 a, a bonding layer 104 b, and a metal layer 150 b. The first substrate 110 b has a first through hole O and a first conductive pad 114 a in the first through hole O. The second substrate 130 a is over the first substrate 110 b. The conductive layer 160 a is between the first substrate 110 b and the second substrate 130 a. The bonding layer 104 b is between the conductive layer 160 a and the first substrate 110 b. In addition, the bonding layer 104 b includes conductive particles 107, such as silver particles. Hence, the bonding layer 104 b can be electrically connected to the conductive layer 160 a and the first conductive pad 114 a through a conductive pillar 117 on the first conductive pad 114 a. The conductive pillar 117 has a top surface in contact with the bonding layer 104 b. The metal layer 150 b is in the first through hole O1, and is on the bottom surface 113 and the sidewall 111 of the first substrate 110 b. The metal layer 150 b is electrically connected to the first conductive pad 114 a. As a result of such a configuration, the metal layer 150 b is electrically connected to the conductive layer 160 a through the first conductive pad 114 a and the bonding layer 104 b. In some embodiments, the metal layer 150 b and the conductive layer 160 a may be formed by performing physical vapor deposition (e.g., sputtering).

FIG. 9 is a cross-sectional view of the chip package 100 c taken along line 9-9 shown in FIG. 7 . As shown in FIG. 7 to FIG. 9 , the metal layer 150 b includes a ground region 152 a and a redistribution line 152 b (RDL). The ground region 152 a is electrically connected to the conductive layer 160 a, while the redistribution line 152 b is electrically isolated from the ground region 152 a. In some embodiments, the ground region 152 a of the metal layer 150 b surrounds the redistribution line 152 b of the metal layer 150 b.

Moreover, the first substrate 110 b has a second through hole O2 and a second conductive pad 114 b in the second through hole O2, and the redistribution line 152 b of the metal layer 150 b is electrically connected to the second conductive pad 114 b. However, no conductive pillar 117 of FIG. 8 is located on the second conductive pad 114 b of FIG. 9 , and thus the redistribution line 152 b and the second conductive pad 114 b are electrically isolated from the bonding layer 104 b and the conductive layer 160 a by the functional layer 116 a.

Since the bonding layer 104 b including the conductive particles 107 is between the conductive layer 160 a and the first substrate 110 b, a portion of the metal layer 150 b (i.e., the ground region 152 a) can be electrically connected to the conductive layer 160 a through the first conductive pad 114 a and the bonding layer 104 b. In some embodiments, the ground region 152 a of the metal layer 150 b may be grounded, and thus the conductive layer 160 a may serve as a shielding layer for electromagnetic interference (EMI). As a result, the chip package 100 c does not need an additional metal can structure to prevent EMI. In other words, the miniaturization of the chip package 100 c containing a shielding layer can be achieved.

In some embodiments, the top surface 112 of the first substrate 110 b has the functional layer 116 a, and the first and second conductive pads 114 a and 114 b are in the functional layer 116 a. The first conductive pad 114 a in the functional layer 116 a is electrically connected to the bonding layer 104 b through the conductive pillar 117 on the first conductive pad 114 a. The entire second conductive pad 114 b is embedded in the functional layer 116 a to be spaced apart from the bonding layer 104 b.

In addition, the first substrate 110 b may be a semiconductor substrate made of silicon. The second substrate 130 a may be a light-transmissive sheet made of glass. If the chip package 100 is used for microelectromechanical systems (MEMS), the conductive layer 160 a may be a shielding layer made of copper, and the functional layer 116 a of the first substrate 110 b may be a MEMS structure. The conductive layer 160 a (i.e., the shielding layer) can prevents the chip package 100 c from electromagnetic interference (EMI). If the chip package 100 c is used for CMOS image sensor (CIS), the conductive layer 160 a may be a shielding layer made of indium tin oxide (ITO) to let light pass through, and the functional layer 116 a of the first substrate 110 b may include an image sensor.

Furthermore, the chip package 100 c further includes a first conductive structure 200 and a second conductive structure 200 a. The first conductive structure 200 is on the bottom surface of the ground region 152 a of the metal layer 150 b. The second conductive structure 200 a is on the bottom surface of the redistribution line 152 b of the metal layer 150 b. The first and second conductive structures 200 and 200 a may be solder balls, and the present disclosure is not limited in this regard. The first and second conductive structures 200 and 200 a may be electrically connected to a printed circuit board. The chip package further includes the passivation layer 190. The passivation layer 190 is below the metal layer 150 b and surrounds the first and second conductive structures 200 and 200 a.

It is to be noted that the connection relationships and materials of the aforementioned elements will not be described again in the following description.

FIGS. 10 and 11 are two cross-sectional views of a chip package 100 d according to one embodiment of the present disclosure. The cross-sectional position of FIG. 10 is the same as that of FIG. 8 , and the cross-sectional position of FIG. 11 is the same as that of FIG. 9 . As shown in FIG. 10 and FIG. 11 , the chip package 100 d includes a first substrate 110 c, a second substrate 130, the conductive layer 160 a, a metal layer 150 b, and a bonding layer 104 c. The difference between this embodiment and the embodiment shown in FIGS. 8 and 9 is that the first substrate 110 c has the concave portion 115 below the conductive layer 160 a. Moreover, the first substrate 110 c has a functional layer 116 b thereon. The functional layer 116 b and the bonding layer 104 c surround the concave portion 115, such that the concave portion 115 of the first substrate 110 c directly face the conductive layer 160 a.

FIG. 12 is a top view of a chip package 100 e according to one embodiment of the present disclosure. FIG. 13 is a cross-sectional view of the chip package 100 e taken along line 13-13 shown in FIG. 12 . As a shown in FIGS. 12 and 13 , the chip package 100 e includes a first substrate 110 d, a second substrate 130, a first conductive layer 160 b, a metal layer 150, and a bonding layer 104 d. The first substrate 110 d has a bottom surface 113 and an inclined sidewall 111 adjoining the bottom surface 113, and an obtuse angle θ is between the bottom surface 113 and the inclined sidewall 111. The second substrate 130 is over the first substrate 110 d and has a portion that laterally extends beyond the inclined sidewall 111 of the first substrate 110 d. The first conductive layer 160 b is between the first substrate 110 d and the second substrate 130. The metal layer 150 is on said portion of the second substrate 130, on the bottom surface 113 and the inclined sidewall 111 of the first substrate 110 d, and electrically connected to an end of the first conductive layer 160 b. The bonding layer 104 d covers the first conductive layer 160 b.

The difference between this embodiment and the embodiment shown in FIGS. 2 and 3 is that the first conductive layer 160 b is an antenna layer which has a patch portion 161 and a connection portion 163. The patch portion 161 has a width W1 greater than a width W2 of the connection portion 163. The connection portion 163 is between the patch portion 161 and the metal layer 150, and has a sidewall in contact with the metal layer 150. Furthermore, the first substrate 110 d is a light-transmissive sheet made of glass without the functional layer 116 of FIGS. 2 and 3 .

In this embodiment, the metal layer 150 is a redistribution line (RDL), and the first conductive layer 160 b electrically connected to the redistribution line acts as an antenna.

In addition, the chip package 100 e further includes a second conductive layer 170 between the bottom surface 113 of the first substrate 110 d and the metal layer 150. Moreover, the chip package further includes a conductive structure 200 a, a planarization layer 180, and a passivation layer 190. The conductive structure 200 a is on a bottom surface of the metal layer 150. The conductive structure 200 a may be a solder ball, and the present disclosure is not limited in this regard. The conductive structure 200 a may be electrically connected to a printed circuit board. Moreover, the planarization layer 180 is between the bottom surface 113 of the first substrate 110 d and the metal layer 150, and is between the inclined sidewall 111 of the first substrate 110 d and the metal layer 150. The passivation layer 190 is below the metal layer 150 and the planarization layer 180, and surrounds the conductive structure 200 a.

In some embodiments, the metal layer 150 and the first conductive layer 160 b may be formed by performing physical vapor deposition (e.g., sputtering).

The chip package 100 e further includes a third substrate 210 below the passivation layer 190 and electrically connected to the metal layer 150. In some embodiments, the third substrate 210 is a radio frequency (RF) chip. As a result of such a configuration, the second conductive layer 170 may serve as a shielding layer for electromagnetic interference (EMI).

Since the chip package 100 e includes the first conductive layer 160 b and the second conductive layer 170 therein, the chip package 100 e does not need an additional metal can structure to prevent EMI, and does not need to connect an additional antenna outside the chip package 110 e. In other words, the miniaturization of the chip package 100 e containing a shielding layer (e.g., the second conductive layer 170) and an antenna (e.g., the first conductive layer 160 b) can be achieved.

Although the present invention has been described in considerable detail with reference to certain embodiments thereof, other embodiments are possible. Therefore, the spirit and scope of the appended claims should not be limited to the description of the embodiments contained herein.

It will be apparent to those skilled in the art that various modifications and variations can be made to the structure of the present invention without departing form the scope or spirit of the invention. In view of the foregoing, it is intended that the present invention covers modifications and variations of this invention provided they fall within the scope of the following claims. 

What is claimed is:
 1. A chip package, comprising: a first substrate having a first through hole and a first conductive pad in the first through hole; a second substrate over the first substrate; a conductive layer between the first substrate and the second substrate; a bonding layer between the conductive layer and the first substrate, wherein the bonding layer comprises conductive particles; and a metal layer in the first through hole, and on a bottom surface of the first substrate and a sidewall of the first substrate, and electrically connected to the conductive layer through the first conductive pad and the bonding layer.
 2. The chip package of claim 1, wherein the metal layer comprises a ground region and a redistribution line, the ground region is electrically connected to the conductive layer, and the redistribution line is electrically isolated from the ground region.
 3. The chip package of claim 2, wherein the first substrate has a second through hole and a second conductive pad in the second through hole, and the redistribution line of the metal layer is electrically connected to the second conductive pad.
 4. The chip package of claim 2, further comprising: a first conductive structure on a bottom surface of the ground region of the metal layer; and a second conductive structure on a bottom surface of the redistribution line of the metal layer.
 5. The chip package of claim 1, wherein the first substrate has a concave portion below the conductive layer.
 6. The chip package of claim 1, further comprising: a passivation layer below the metal layer.
 7. The chip package of claim 6, wherein the passivation layer is in contact with the metal layer.
 8. The chip package of claim 1, further comprising: a conductive pillar located on the first conductive pad and surrounded by the bonding layer.
 9. The chip package of claim 8, wherein the conductive pillar is in contact with at least one of the conductive particles of the bonding layer.
 10. The chip package of claim 8, wherein a top surface of the conductive pillar is lower than a bottom surface of the conductive layer.
 11. The chip package of claim 8, wherein the first substrate has a functional layer, and the bonding layer is between the functional layer and the conductive layer.
 12. The chip package of claim 11, wherein the functional layer has a portion between the conductive pillar and the first conductive pad.
 13. The chip package of claim 1, wherein the first substrate has a concave portion between the conductive layer and the first substrate.
 14. The chip package of claim 13, wherein the first substrate has a functional layer, and the concave portion is surrounded by the functional layer and the bonding layer.
 15. The chip package of claim 13, wherein the concave portion of the first substrate directly faces the conductive layer. 